CI: Switch centos:8 to centos:stream8 image

[bastelfreak]

No description provided.

[bastelfreak]

cherry-picked from #58

[codecov]

Codecov Report

Merging #61 (0b90a48) into master (b49e259) will not change coverage.
The diff coverage is n/a.

❗ Current head 0b90a48 differs from pull request most recent head 7a135e6. Consider uploading reports for the commit 7a135e6 to get more accurate results

@@           Coverage Diff           @@
##           master      #61   +/-   ##
=======================================
  Coverage   84.00%   84.00%           
=======================================
  Files           1        1           
  Lines         300      300           
=======================================
  Hits          252      252           
  Misses         48       48           

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[ekohl]

Thanks!